Cooling unit



FIG. 1 is a front perspective view of a cooling unit in accordance with the new design;

FIG. 2 is a top and left internal side perspective view thereof;

FIG. 3 is a partial top and rear internal side perspective view thereof;

FIG. 4 is a top and left internal side perspective view thereof; and,

FIG. 5 is a partial top and rear internal side perspective view thereof.

The broken lines in FIGS. 1, 2, 3, and 4 illustrate aspects of the design that form no part of the claim. 

The ornamental design for cooling unit, as shown and described. 